Guard-gate for swing-bridges



(No Model.) 3 SheQts -Sheet 1.

' .L. J; KRON'A'WITTER w GUARD GATE FOR SWING BRIDGES;

No. 550,105. Pate nted Nov. 19,1895.

no Model.)

L-. J.' KRONA-WITTER. GUARD GATE FOR SWING BRIDGES.

3 Sheets-Sheet 2.

Patented Nov. 19, 1895'.

ANDREW HERMAN. PHUI'O-LI'IHOWASNINFIBNJ C.

' UNITED STATES I PATENT OFFIC LAWRENCE JKRONAWITTER, OF CHICAGO, ILLINOIS.

GUARD-GATE FOR SWING-BRIDGES.

SPECIFICATION forming part of Letters Patent No. 550,105, dated November 19, 1895.

Application filed August 27, 1894. Serial No. 521,378. (No model.)

To all whom it may concern.-

Be it known that I, LAWRENCE J. KRONA- WITTER, a citizen of the United States, residing at Chicago, in thecounty of Cook and State of Illinois, have invented certain new anduseful Improvements in Guard-Gates for Swing-Bridges, of which the following is a full, clear, and exact description of the invention, that will enable others to make and use the same, reference being had to the accompanying drawings, forming a part of this specification. I

This invention relates to improvements in the class of guard-gates that are located at the respective ends of swing-bridges for the purpose of closing the approach thereto when the draw is open, the gates being opened and closed automatically coincident with the movement of the bridge.

Figure 1 is a broken-away elevation lookin g outwardly from the bridge, which is shown in section, the gates being in their open position; Fig. 2, a broken-away longitudinal section on line 2, Fig. 1, looking in the direction indicated by the arrow; Fig. 3, a brokenaway elevation looking outwardly from the bridge, which is not shown, the gates being closed and the draw open; Fig. 4, a brokenaway plan; Fig. 5, a diagrammatic plan of the mechanism located in the bridge approach or abutment which forms the operating connection between the ends of the bridge and gates; Fig. 6, a broken-away elevation of one of the gates in detail; Fig. 7, a vertical section on line 7, Fig 6; and Fig. 8, a broken-away part of one of the gates in perspective.

The gates are double and have a rolling movement in a horizontal plane, meeting in the center of the bridge approach when closed and open away from each other toward the respective sides, the tracks curving along parallel to the side railing of the footway, as illustrated in Fig. 44.

The gates comprise a series of jointed sections hinged or pivoted together, so as to conform to the curvature of the track.

A is the bridge-approach 5 A, the abutment B, the bridge, andO G the gates.

The gates consist of a number of sections a, hinged together, as at d, and are supported in a suspended position from an overhead track by a number of hangers D, bolted to the gates, as at o The upper ends of the hangers terminate in a head a in which are journaled track-rollers a, confined between the doubletrack rails D D supported 011 a number of posts a The series of rollers have a grooved periphery an d engage with the adjacent tracking edges of the rails. The doublerails make it impossible for the rollers to become misplaced. The lower ends of the gates bear against the guide or back rail a A sectional rack-bar b is secured to the lower ends of the gates. At one side of the approach is located a pinion-wheel b ,mounted on a vertical shaft 19 journaled in a bracket b rigidly bolted in place. At the opposite side is located a companion pinion-wheel b mounted on a shaft b journaled in bracket 1). These pinion-wheels are adapted to engage with the rack-bar on the gates. Sprocket-wheels d and d are mounted on' shaft 19 A link-belt d connects sprocket-wheel d with a sprocket-wheeld mounted on shaft c1 A pinion-wheel d is also mounted on shaft d and is adapted, Fig. 5, to engage with the rack-bar E, secured to the end of the bridge. A link-belt d connects sprocket-wheel d with a sprocket-wheel 01 Fig. '5, mounted on shaft 01 A pinion-wheel d is also mounted on shaft d and engages with pinion-wheel g, mounted on shaft g. A sprocket-wheel g is also mounted on shaft g and connects 'with sprocket-wheel 9 mounted on shaft b by means of link-belt g*. A second sprocketwheel g 'is also mounted on shaft 17 and connects with sprocket-wheel 9 mounted on shaft 9 by link-belt g Apinion-wheel g is also mounted on shaft g and is adapted to engage with rack-bar E, secured to the bridge. This system of geared and belted connections are in duplicate at each side of the bridge, so that no matter which way the bridge is moved in opening or closinga simultaneous movement is imparted to each gate. The trackrails extend straight across the width of the bridge-approach and then curve around and run back, so that the gates when open are parallel with the guard-railing of the approach.

By constructing the gates in sections they conform to the curved track, and when'open are entirely out of the way and do not proj ect from each side of the bridge-approach as they would were the tracks straight.

ICO

link-belt d", sprocket-wheel d shaft (1 pinion-wheel d, pinion-wheel g, shaft 9', sp1roeket-wheel g sprocket-wheel g link-belt g", sprocket-wheel g sproeketwheel g, shaft g link-belt g pinion-Wheel, and the rackbar secured to the end of the bridge, whereby the gate or gates may be opened or closed by the movement of the bridge, substantially as set forth.

LAWVRENCE J. KRONAWITTER.

\Vitnesses L. M. FREEMAN, J. B. DONALSON. 

